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<Title>White Semicircle Meters</Title>
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<p class="heading0">ChartDirector 7.0 (Java Edition)</p>
<p class="heading1">White Semicircle Meters</p>
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<div class="content">
<img src="images/whitesemicirclemeter0.png" width='300' height='180'>&nbsp;&nbsp;<img src="images/whitesemicirclemeter1.png" width='300' height='180'>&nbsp;&nbsp;<img src="images/whitesemicirclemeter2.png" width='300' height='180'>&nbsp;&nbsp;<img src="images/whitesemicirclemeter3.png" width='300' height='180'>&nbsp;&nbsp;<img src="images/whitesemicirclemeter4.png" width='300' height='180'>&nbsp;&nbsp;<img src="images/whitesemicirclemeter5.png" width='300' height='180'>
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This example demonstrates semicircle meters with a soft white background and a silver border.<br><br>
The white background in this example is actually a radial gradient. It is fully white at the center, changing to light grey at the border. This creates a "softer" white effect. The radial gradient is created using <a href="AngularMeter.relativeRadialGradient.htm">AngularMeter.relativeRadialGradient</a>.<br><br>
The silver border effect is achieved by using <a href="AngularMeter.relativeLinearGradient.htm">AngularMeter.relativeLinearGradient</a> to create a gradient consisting of varying levels of grey.<br><br>
The soft white gradient and the silver gradient are applied to the meter background and border using <a href="AngularMeter.addScaleBackground.htm">AngularMeter.addScaleBackground</a>.<br><br>
Because the background and border color are similar, to make the border easier to distinguish from the background, the <a href="AngularMeter.addScaleBackground.htm">AngularMeter.addScaleBackground</a> is called one more time to add a 1-pixel grey boundary between the border and the background.
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<p class="heading1a">Source Code Listing</p>
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<b>[JSP Version]</b> jspdemo/whitesemicirclemeter.jsp
<div class='codeblock'><code class='pre'>&lt;%@page import="ChartDirector.*, java.util.*" %&gt;
&lt;%!
// Function to create the demo charts
void createChart(WebChartViewer viewer, int chartIndex)
{
    // The value to display on the meter
    double value = 72.55;

    // Create an AngularMeter object of size 300 x 180 pixels with transparent background
    AngularMeter m = new AngularMeter(300, 180, Chart.Transparent);

    // Set the default text and line colors to very dark grey (0x222222)
    m.setColor(Chart.TextColor, 0x222222);
    m.setColor(Chart.LineColor, 0x222222);

    // Center at (150, 150), scale radius = 128 pixels, scale angle -90 to +90 degrees
    m.setMeter(150, 150, 128, -90, 90);

    // Gradient color for the border to make it silver-like
    double[] ringGradient = {1, 0x999999, 0.5, 0xdddddd, 0, 0xf8f8f8, -0.5, 0xdddddd, -1, 0x999999};

    // Background gradient color from white (0xffffff) at the center to light grey (0xdddddd) at the
    // border
    double[] bgGradient = {0, 0xffffff, 0.75, 0xeeeeee, 1, 0xdddddd};

    // Add a scale background of 148 pixels radius using the gradient background, with a 10 pixel
    // thick silver border
    m.addScaleBackground(148, m.relativeRadialGradient(bgGradient, 148), 10,
        m.relativeLinearGradient(ringGradient, 45, 148));

    // Add a 1 pixel light grey (0xbbbbbb) line at the inner edge of the thick silver border (radius
    // = 138) to enhance its contrast with the background gradient
    m.addScaleBackground(138, Chart.Transparent, 1, 0xbbbbbb);

    // Meter scale is 0 - 100, with major tick every 20 units, minor tick every 10 units, and micro
    // tick every 5 units
    m.setScale(0, 100, 20, 10, 5);

    // Set the scale label style to 15pt Arial Italic. Set the major/minor/micro tick lengths to
    // 16/16/10 pixels pointing inwards, and their widths to 2/1/1 pixels.
    m.setLabelStyle("Arial Italic", 16);
    m.setTickLength(-16, -16, -10);
    m.setLineWidth(0, 2, 1, 1);

    // Demostrate different types of color scales and putting them at different positions
    double[] smoothColorScale = {0, 0x3333ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100,
        0xff0000};
    double[] stepColorScale = {0, 0x00cc00, 60, 0xffdd00, 80, 0xee0000, 100};
    double[] highLowColorScale = {0, 0x00ff00, 70, Chart.Transparent, 100, 0xff0000};

    if (chartIndex == 0) {
        // Add the smooth color scale at the default position
        m.addColorScale(smoothColorScale);
    } else if (chartIndex == 1) {
        // Add the smooth color scale starting at radius 128 with zero width and ending at radius
        // 128 with 16 pixels inner width
        m.addColorScale(smoothColorScale, 128, 0, 128, -16);
    } else if (chartIndex == 2) {
        // Add the smooth color scale starting at radius 70 with zero width and ending at radius 60
        // with 20 pixels outer width
        m.addColorScale(smoothColorScale, 70, 0, 60, 20);
    } else if (chartIndex == 3) {
        // Add the high/low color scale at the default position
        m.addColorScale(highLowColorScale);
    } else if (chartIndex == 4) {
        // Add the step color scale at the default position
        m.addColorScale(stepColorScale);
    } else {
        // Add the smooth color scale at radius 60 with 15 pixels outer width
        m.addColorScale(smoothColorScale, 60, 15);
    }

    // Add a text label centered at (150, 125) with 15pt Arial Italic font
    m.addText(150, 125, "CPU", "Arial Italic", 15, Chart.TextColor, Chart.BottomCenter);

    // Add a red (0xff0000) pointer at the specified value
    m.addPointer2(value, 0xff0000);

    // Output the chart
    viewer.setChart(m, Chart.SVG);
}
%&gt;
&lt;%
// This example includes 6 charts
WebChartViewer[] viewers = new WebChartViewer[6];
for (int i = 0; i &lt; viewers.length; ++i) {
    viewers[i] = new WebChartViewer(request, "chart" + i);
    createChart(viewers[i], i);
}
%&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;White Semicircle Meters&lt;/title&gt;
    &lt;!-- Include ChartDirector Javascript Library to support chart interactions --&gt;
    &lt;script type="text/javascript" src="cdjcv.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body style="margin:5px 0px 0px 5px"&gt;
    &lt;div style="font:bold 18pt verdana;"&gt;
        White Semicircle Meters
    &lt;/div&gt;
    &lt;hr style="border:solid 1px #000080; background:#000080" /&gt;
    &lt;div style="font:10pt verdana; margin-bottom:1.5em"&gt;
        &lt;a href="viewsource.jsp?file=&lt;%=request.getServletPath()%&gt;"&gt;View Source Code&lt;/a&gt;
    &lt;/div&gt;
    &lt;!-- ****** Here are the chart images ****** --&gt;
    &lt;%
        for (int i = 0; i &lt; viewers.length; ++i) {
            out.write(viewers[i].renderHTML(response));
            out.write(" ");
        }
    %&gt;
&lt;/body&gt;
&lt;/html&gt;</code></div>
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